feat: Expose initial_metadata in GrpcHealthCheck

changelog/v1.15.0-beta23/expose-initialmetadata-grpchealthcheck.yaml

@@ -0,0 +1,6 @@
+changelog:
+- type: NEW_FEATURE
+  issueLink: https://github.com/solo-io/gloo/issues/8490
+  resolvesIssue: true
+  description: >-
+    Adds the ability to pass `initial_metadata` while configuring a GrpcHealthCheck. It specifies a list of key-value pairs that should be added to the metadata of each GRPC call that is sent to the health checked cluster.

install/helm/gloo/crds/gloo.solo.io_v1_Upstream.yaml

@@ -559,6 +559,28 @@ spec:
                       properties:
                         authority:
                           type: string
+                        initialMetadata:
+                          items:
+                            properties:
+                              append:
+                                nullable: true
+                                type: boolean
+                              header:
+                                properties:
+                                  key:
+                                    type: string
+                                  value:
+                                    type: string
+                                type: object
+                              headerSecretRef:
+                                properties:
+                                  name:
+                                    type: string
+                                  namespace:
+                                    type: string
+                                type: object
+                            type: object
+                          type: array
                         serviceName:
                           type: string
                       type: object

pkg/utils/api_conversion/health_check.go

@@ -161,10 +161,15 @@ func ToEnvoyHealthCheck(check *envoycore_gloo.HealthCheck, secrets *v1.SecretLis
 		}
 
 	case *envoycore_gloo.HealthCheck_GrpcHealthCheck_:
+		var initialMetadata, err = ToEnvoyHeaderValueOptionList(typed.GrpcHealthCheck.GetInitialMetadata(), secrets, secretOptions)
+		if err != nil {
+			return nil, err
+		}
 		hc.HealthChecker = &envoy_config_core_v3.HealthCheck_GrpcHealthCheck_{
 			GrpcHealthCheck: &envoy_config_core_v3.HealthCheck_GrpcHealthCheck{
-				ServiceName: typed.GrpcHealthCheck.GetServiceName(),
-				Authority:   typed.GrpcHealthCheck.GetAuthority(),
+				ServiceName:     typed.GrpcHealthCheck.GetServiceName(),
+				Authority:       typed.GrpcHealthCheck.GetAuthority(),
+				InitialMetadata: initialMetadata,
 			},
 		}
 	case *envoycore_gloo.HealthCheck_CustomHealthCheck_:
@@ -253,8 +258,9 @@ func ToGlooHealthCheck(check *envoy_config_core_v3.HealthCheck) (*envoycore_gloo
 	case *envoy_config_core_v3.HealthCheck_GrpcHealthCheck_:
 		hc.HealthChecker = &envoycore_gloo.HealthCheck_GrpcHealthCheck_{
 			GrpcHealthCheck: &envoycore_gloo.HealthCheck_GrpcHealthCheck{
-				ServiceName: typed.GrpcHealthCheck.GetServiceName(),
-				Authority:   typed.GrpcHealthCheck.GetAuthority(),
+				ServiceName:     typed.GrpcHealthCheck.GetServiceName(),
+				Authority:       typed.GrpcHealthCheck.GetAuthority(),
+				InitialMetadata: ToGlooHeaderValueOptionList(typed.GrpcHealthCheck.GetInitialMetadata()),
 			},
 		}
 	case *envoy_config_core_v3.HealthCheck_CustomHealthCheck_:

projects/gloo/api/external/envoy/api/v2/core/health_check.proto

@@ -180,6 +180,11 @@ message HealthCheck {
         // left empty (default value), the name of the cluster this health check is associated
         // with will be used.
         string authority = 2;
+
+        // Specifies a list of key-value pairs that should be added to the metadata of each GRPC call
+	    // that is sent to the health checked cluster.
+        repeated .solo.io.envoy.api.v2.core.HeaderValueOption initial_metadata = 3
+        [(validate.rules).repeated .max_items = 1000];
     }